[Bug c++/104765] Expression statement with a return in a lambda-parameter-default causes segfault when called in a different function

[aaron at aaronballman dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104765

Aaron Ballman <aaron at aaronballman dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |aaron at aaronballman dot com

--- Comment #3 from Aaron Ballman <aaron at aaronballman dot com> ---
Here's another example that causes diagnostics and then ICEs in a different
way: https://godbolt.org/z/nWTGEc1dW

template <typename Callable>
int foo(Callable&& Call) {
  return Call();
}

int main() {
  auto l = [](int a = ({ int x = 12; x; })) {
    return a;
  };
  return foo(l);
}


(I was trying to see how well the locally-declared `x` in the lambda's default
argument worked in practice.) Consider me a +1 for prohibiting statement
expressions in lambda default arguments.